Malicious PDF — malware analysis report

Static analysis result for SHA-256 8385221f5b31d8a7…

MALICIOUS

PDF

95.3 KB Created: 2021-08-10 12:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a9694dd66ca761eb43ef3e23828295e8 SHA-1: d5abcded8faf4d05492ab1c593ae4a1ad8c9e75c SHA-256: 8385221f5b31d8a723eb31e7ee8b7f32213e077a54604062b62619f5579d3a37
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious characteristics, including a high ML classifier score and a critical ClamAV detection as a phishing trojan. It contains numerous links to potentially compromised websites, suggesting it's part of a link farm designed to host malicious content. The document also includes an instruction to disable security software, a common tactic to facilitate payload execution. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d706a3d0ae---sagexujez.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7e53eec2d93260b3466f7f89d4451a1c/47695786815.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/15151112312.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b74b5918ecb3d3c5f8ffa92f430bebef/29501228241.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021630238472182.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c284285432f---zeripemisomosunoze.pdfIn PDF document text
    • http://centrons.com/uploaded/file/209315995260d2cb9e28e41.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zuzujupixapinirigumavexa.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/1975004953.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/kodixeguwimijivetafov.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/riwuwokarowonowatisemon.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04ecd8210d8b73b8b1d8476a04d0a86a/wosodexoguzep.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48f33bad9---fofuxoxunizaxaboted.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb56d6a0f5---53171180416.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/teruxadamavifiguked.pdfIn PDF document text
    • http://klinok-saintp.ru/files/dorugavanatepi.pdfIn PDF document text
    • http://parilka.by/var/upload/file/47777469221.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98654f4b5---lapurev.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e27d3cfcb921a37bc7057776767e1e22/ropanuvozumapip.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8660e061---magamirebulepixibojes.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/94729624241.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9fa2653d---69213153549.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/93824301934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vcds+lite+crack+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 19484 bytes
SHA-256: 344eef59d14dcb3bd754bd678b50e9da478263e7f3ae2136f7b8a2167c556a57
font_01_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 10616 bytes
SHA-256: 65647135689319618513ce72201b71de444e044e2af53ff9fc255caeb391e814
font_03_sfnt_off000154ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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